Method and Apparatus of Storage Tier and Cache Management

1. A storage system, comprising: a memory configured to store command history information that comprises a history of commands; an interface configured to receive a command from a computer; and a controller configured to: create, as a group, a relationship between a plurality of areas storing a plurality of data accessed by the command; manage the plurality of data of the plurality of the areas at a same access level based on the relationship, wherein the group is formed from the plurality of areas based on the command history information; and migrate the plurality of data of the plurality of the areas as a group between tier storage pools based on the same access level.

2. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, the controller is configured to copy the first data to a copy destination in the first tier storage pool as a second data; and wherein when the interface receives a subsequent read/write command for the second data, the controller is configured to change a tier of a group associated with the first data to a lower tier, and move the first data to a second tier storage pool.

3. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, the controller copies the first data to a copy destination in the first tier storage pool as a second data; wherein when the interface receives a subsequent read/write command for the first data, the controller is configured to change a tier of a group associated with the second data to a lower tier, and move the second data to a second tier storage pool.

4. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, the controller copies the first data to a copy destination in the second tier storage pool as a second data; wherein when the interface receives a subsequent read/write command for the first data, the controller is configured to change a tier of a group associated with the first data to a higher tier, and move the first data to a first tier storage pool.

5. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, the controller copies the first data to a copy destination in the second tier storage pool as a second data; wherein when the interface receives a subsequent read/write command for the second data, the controller is configured to change a tier of a group associated with the second data to a higher tier and move the second data to a first tier storage pool.

6. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, the controller is configured to move the first data to cache and copy the first data in the cache to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the second data, the controller is configured to change a tier of a group associated with the second data to a higher tier, and move the second data to a first tier storage pool.

7. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, the controller is configured to move the first data to cache and copy the moved first data to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the first data, the controller is configured to change a tier of a group associated with the first data to a higher tier, move the first data to a first tier storage pool, and move the second data to the second tier storage pool.

8. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, the controller is configured to move the first data to cache and copy the moved first data to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the first data, the controller is configured to change a tier of a group associated with the second data to a lower tier, move the first data to the first tier storage pool, and move the second data to a second tier storage pool.

9. The storage system of claim 1 , wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, the controller is configured to move the first data to cache and copy the moved first data to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the second data, the controller is configured to change a tier of a group associated with the first data to a lower tier, move the first data to a second tier storage pool, and move the second data to the first tier storage pool.

10. A method, comprising: receiving a command from a computer; creating, as a group, a relationship between a plurality of areas storing a plurality of data accessed by the command; managing the plurality of data of the plurality of the areas at a same access level based on the relationship, wherein the group is formed from the plurality of areas based on command history information that comprises a history of commands; and migrating the plurality of data of the plurality of the areas as a group between tier storage pools based on the same access level.

11. The method of claim 10 , further comprising: when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, copying the first data to a copy destination in the first tier storage pool as a second data; and wherein when the interface receives a subsequent read/write command for the second data, changing a tier of a group associated with the first data to a lower tier, and moving the first data to a second tier storage pool.

12. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, copying the first data to a copy destination in the first tier storage pool as a second data; and wherein when the interface receives a subsequent read/write command for the first data, changing a tier of a group associated with the second data to a lower tier, and moving the second data to a second tier storage pool.

13. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, copying the first data to a copy destination in the second tier storage pool as a second data; wherein when the interface receives a subsequent read/write command for the first data, changing a tier of a group associated with the first data to a higher tier, and moving the first data to a first tier storage pool.

14. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, copying the first data to a copy destination in the second tier storage pool as a second data; wherein when the interface receives a subsequent read/write command for the second data, changing a tier of a group associated with the second data to a higher tier and moving the second data to a first tier storage pool.

15. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, moving the first data to cache and copying the first data in the cache to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the second data, changing a tier of a group associated with the second data to a higher tier, and moving the second data to a first tier storage pool.

16. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a second tier storage pool, moving the first data to cache and copying the moved first data to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the first data, changing a tier of a group associated with the first data to a higher tier, moving the first data to a first tier storage pool, and moving the second data to the second tier storage pool.

17. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, moving the first data to cache and copying the moved first data to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the first data, changing a tier of a group associated with the second data to a lower tier, moving the first data to the first tier storage pool, and moving the second data to a second tier storage pool.

18. The method of claim 10 , further comprising: wherein when the command is a copy offload command for a first data of the plurality of data in a first tier storage pool, moving the first data to cache and copying the moved first data to a copy destination in the cache as a second data; wherein when the interface receives a subsequent read/write command for the second data, changing a tier of a group associated with the first data to a lower tier, moving the first data to a second tier storage pool, and moving the second data to the first tier storage pool.

19. The method of claim 10 , further comprising creating the group based on a received command token.

20. A non-transitory computer readable storage medium storing instructions for executing a process, the instructions comprising: receiving a command from a computer; creating, as a group, a relationship between a plurality of areas storing a plurality of data accessed by the command; managing the plurality of data of the plurality of the areas at a same access level based on the relationship, wherein the group is formed from the plurality of areas based on command history information that comprises a history of commands; and migrating the plurality of data of the plurality of the areas as a group between tier storage pools based on the same access level.